French Patent # 791,757 Addition # 49,094 - Simplex

French Patent 791,757 Addition 49,094- Simplex Champion du Monde main image

Here we have the Simplex Champion du Monde - arguably the first derailleur to become a mass produced, aftermarket, standalone product in the way that we know derailleurs today.

Scan 3 seems to have been made by someone on work experience the day before they got their scanner training.

Browse associated derailleurs.

Simplex Champion du Monde Extra-Leger derailleur thumbnail